Objective: Solve add to with change unknown math stories as a context for counting on by drawing, writing equations, and making statements of the solution.
The introduction of the add to with change unknown problem type (1.OA.6) occurs in Lesson 11. This lesson allows students explorations with problems where the action, which represents the change, is unknown. For example, “Ben has 5 pencils. He got some more from his mother. Now, he has 9 pencils. How many pencils did Ben get from his mother?” Students physically add more to the starting quantity, counting on until they reach the total; for the first time in Module 1, students simply must use the valuable Level 2 strategy of counting on in order to determine the unknown part.
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